Francis X. Rocca has written a revealing article on the Society of Saint Pius X (SSPX) and Bishop Richard Williamson

VATICAN CITY—The head of an ultra-traditionalist Catholic group has repudiated statements by one of his bishops that deny the horror of the Holocaust, and insists that his organization opposes bigotry against Jews.

. . . Nevertheless, the vision of Catholic-Jewish relations reflected in official SSPX literature, and in past statements by the society’s leaders, is an unmistakably antagonistic one, with Jews in the role of Christianity’s principal “enemies.”